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首页> 外文期刊>Earth, planets and space: EPS >Long-period ground motions from a large offshore earthquake: The case of the 2004 off the Kii peninsula earthquake, Japan
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Long-period ground motions from a large offshore earthquake: The case of the 2004 off the Kii peninsula earthquake, Japan

机译：一场大型海上地震的长期地面运动：以2004年日本纪伊半岛地震为例

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The 2004 off the Kii Peninsula earthquake excited long-period ground motions over a wide area of Honshu Island of Japan. This remarkable excitation was observed in the Osaka, Nobi, and Kanto basins as well as in the Omaezaki region. The record section indicates two types of developed long-period motions by the basin surface waves, either by the source or passage effect of the shallow and large offshore earthquake. Their combination resulted in the well-developed long-period ground motions observed within the distant basins as those during the 1985 Michoacan and 2003 Tokachi-oki earthquakes did. The distributions of pseudo-velocity response spectra confirmed this development at periods of 5-7 s in the Osaka and Nobi basins and of 7-10 s in the Kanto basin. The comparison of the distributions with the thicknesses of the sediments and the S-wave velocities of the surface layers shows that these characteristics of the long-period ground motions are closely related to the structures of the basins. The earthquake provided a timely warning of damaging long-period ground motions from future megathrust events in the Tonankai, Nankai, and Tokai regions.
机译：2004年纪伊半岛地震引发了日本本州岛大范围的长期地面运动。在大阪，Nobi和关东盆地以及在前关崎地区都观察到了这种惊人的激发。记录部分显示了由盆地表面波形成的两种类型的长期运动，可能是浅层和大型海上地震的震源或通道效应。他们的结合导致了在遥远盆地中观察到的发达的长周期地震动，与1985年米却肯州和2003年十胜井地震一样。伪速度响应谱的分布证实了在大阪和Nobi盆地的5-7 s和关东盆地的7-10 s期间的这种发展。将沉积物的厚度分布与表层的S波速度进行比较，结果表明，长周期地震动的这些特征与盆地的结构密切相关。地震及时警告了未来在Tonankai，Nankai和Tokai地区发生的大推力事件会损害长期地面运动。

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